xboxlive arcade games become demos

i have been having issues with my arcade games that i have bought such as sonic and streets of rage.. i bought them about a year ago and i played them for a while and got many of the achievements but now when i try to play them it tells me they are demos.
i have tried re-downloading, ive tried deleting and re-downloading but nothing works. ive also tried emailing xbox support but they keep telling the same things ive already tried.anyone have any ideas of what i can do?

Question Info

Hey there Esgee! Are you still playing on the same console as the games were first purchased on? Were they purchased with your account? Also, are you trying to play them while connected to LIVE?

You may need to do a license transfer if you have moved to a new console. I'd like to have you wait to do that until you post back that information. License transfers can only be done once every four months, so I want to make sure before we go ahead with that.
Thanks!